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https://issues.apache.org/jira/browse/FLINK-22641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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金翔 reopened FLINK-22641:
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> The description of watermark in the Timely Stream Processing directory of
> Concepts in Flink 1.13.0
> --------------------------------------------------------------------------------------------------
>
> Key: FLINK-22641
> URL: https://issues.apache.org/jira/browse/FLINK-22641
> Project: Flink
> Issue Type: Improvement
> Components: Documentation
> Reporter: 金翔
> Priority: Minor
> Attachments: image-2021-05-12-15-36-47-223.png,
> image-2021-05-12-15-37-26-377.png
>
>
> In the Flink 1.13.0 document, in the Timely Stream Processing document Event
> Time and Watermarks
> (https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/concepts/time/#event-time-and-watermarks)
> describe the disorder of watermark and event timestamp. because A
> _Watermark(t)_ declares that event time has reached time _t_ in that stream,
> meaning that there should be no more elements from the stream with a
> timestamp _t' <= t_ (i.e. events with timestamps older or equal to the
> watermark). When w (11) arrives, e (14) and E (15) should change their
> positions. Similarly, E(19) and E (22) should switch positions when w (17)
> arrives。The original and modified drawings are attached, thank you！！！
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